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UPDATE: Three Share Nobel Prize for Study of Exotic States of Matter

UPDATE: Three Share Nobel Prize for Study of Exotic States of Matter

2016 Nobel Prize in Physics honors theoretical discoveries that help scientists understand unusual properties of materials, such as superconductivity and superfluidity.

Tuesday, October 4, 2016 - 11:00

Yuen Yiu, Staff Writer

Editor's note: updated at 12:45 p.m. to include additional comments and context

(Inside Science) -- The 2016 Nobel Prize in physics was awarded to three physicists who used advanced mathematical methods to study exotic states of matter.

The prize goes jointly to David J. Thouless of the University of Washington in Seattle, F. Duncan M. Haldane of Princeton University in New Jersey, and J. Michael Kosterlitz of Brown University in Rhode Island, "for theoretical discoveries of topological phase transitions and topological phases of matter."

Working in the field of condensed matter theory, they revolutionized the understanding of unusual phases of matter such as superconductors, superfluids and thin magnetic films. The discoveries are now guiding the quest for next generation materials for electronics, quantum computing and more.

What is condensed matter physics?

Roughly half of all Nobel Prizes in physics from the last decade have been awarded to research in condensed matter physics.

This branch of physics focuses on the study of physical properties of "condensed" materials such as solids and liquids. In terms of research attention and applicability to the public, it is probably the most popular field of physics today, largely due to its close ties with technological advancements and immediate applications. 

Research in condensed matter physics has led to numerous innovations that have greatly impacted modern life. For example, the discovery of giant magnetoresistance in the late 1980s made modern computer hard drives possible. More recently, discoveries such as graphene, a single-layer sheet of carbon atoms, have inspired engineers to improve current methods for energy storage and transmission.  

The study of topological properties in materials is one of the frontier areas in condensed matter physics, for which many scientists are hopeful to find application in the near future.

This year's Nobel laureates David Thouless, Duncan Haldane, and Michael Kosterlitz developed mathematical models for describing and connecting the topological properties of materials in relation to other strange phenomena such as superconductivity, superfluidity and other peculiar magnetic properties. In particular, Kosterlitz and Thouless focused on studying the topologies in 2-D materials, while Haldane developed models for 1-D or near 1-D materials.

What are topological phases?

Solids, liquids, and gases are phases of matter that everyone is familiar with. Transitions between these phases are also well understood. However, there are other kinds of phase transitions -- such as something called topological phase transitions -- that are not as well studied and understood. And today's winners have been awarded for their work in these areas.

Topology is a property of matter that remains unchanged when the object is flattened or expanded. For example, a coffee mug and a donut share the same topology, because, at least theoretically, one can be mushed into the shape of the other without breaking anything apart, as the hole of the donut can become the handle of a newly formed coffee cup, or vice versa. Scientists have found that the concept of topology is extremely useful for describing certain changes in materials, specifically those that jump from one state to the next with no in-between states. This is analogous to the number of holes in a 3-D object, since you can have one hole or two holes, but not one and a half holes.

Topology is particularly important for understanding materials with properties in just one or two dimensions, such as electrons or magnetic moments that are confined to a line or a surface. These phases contain properties and transitions otherworldly from those found in the more familiar 3-D space.

Although, scientists originally focused on topological properties in 1-D and 2-D materials, they have since discovered them in 3-D materials as well. Those insights are especially important when it comes to understanding exotic phenomena such as superconductivity, which lets electrons travel through materials with zero resistance, and superfluidity, which lets fluids flow with zero loss of kinetic energy.

One of the hottest research fields in condensed matter physics today is the study of topological insulators, superconductors and metals. In brief, these are materials with electronic properties closely related to their topological ones.

There is great expectation that the theories developed by the Nobel laureates will guide improvements in electronics and superconductors, as well as futuristic quantum computers, and perhaps something not even conceived yet.

What is their discovery?

"This prize here is for theoretical discoveries. It has combined beautiful mathematical and profound physics insights and has achieved unexpected results that have been confirmed by experiments," said Thors Hans Hansson, a member of the Nobel Committee for Physics, in a presentation during the Nobel Prize press conference.

The theoretical works by this year's laureates transformed and expanded the common understanding of phase transitions in materials. Before their research, the understanding of these changes, such as those between gases, liquids and solids, hinged upon the geometrical arrangement of particles or atoms, or what physicists call the symmetry of the system.

Thouless, Haldane, and Kosterlitz discovered that similar to symmetry, the topology of materials also plays an important role in many kinds of phase transitions.

"They're showing that there are ways of classifying states of matter without worrying about the details of the symmetry. That is the radical departure," said Zahid Hasan, a physicist from Princeton University in New Jersey.

Through this revelation the laureates were able to construct a theoretical foundation to explain many previously mysterious phase transitions, such as between a superconducting and non-superconducting phase, or a magnetic and a non-magnetic phase.

"What we ultimately are looking for in science and particularly in physics is these kind of grand encompassing ideas which explain many things at the same time," said Peter Armitage, a physicist from Johns Hopkins University in Baltimore. Almost always, "that insight comes in a very specific instance, like it is here, which was a completely new way of looking at the states of matter," he said.

"I think this is the beginning and not the end," said Eduardo Fradkin, a condensed matter theorist at the University of Illinois at Urbana-Champaign.  "Even though some of this work was done in the late '70s and early '80s, it has continued to have profound impact."

What is it good for?

During the press conference, Hansson said, "This work has inspired lots of activity in labs all over the world. Scientists are hoping for practical applications in new electronics, new materials, even perhaps in components in the future quantum computer."

Since the laureates' discoveries, the study of topological insulators, superconductors, and metals has become one of the hottest research areas in condensed matter physics. These materials are defined by the connection between their electronic and topological properties.

Topological materials, in particular topological insulators, have already greatly advanced the current understanding of superconductivity. This renewed understanding of superconductivity has since provided a theoretical foundation for the hunt for a room temperature superconductor. If that quest is successful, it may one day change our lives as much as the discovery of electricity.

"[The discovery] told us that quantum mechanics can behave far more strangely than we would have guessed and we really haven't understood all the possibilities yet," Haldane told the audience during the announcement, "we have a long way to go to discover what's possible, and a lot of these things were things that one wouldn't initially have dreamed were possible."

 

Editor's Note: Inside Science also released a brief story shortly following the announcement of the 2016 Nobel Prize in Physics. That story can be found here. All of our coverage of the 2016 prizes is available here.

For our coverage of other Nobel Prizes from recent years, please click here.

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Yuen Yiu covers the Physics beat for Inside Science. He's a Ph.D. physicist and fluent in Cantonese and Mandarin. Follow Yuen on Twitter: @fromyiutoyou.